Subsea well intervention technology specialist Interventek has announced the launch of a new API 17G qualified, in-riser subsea landing string system.

The Revolution-7 landing string is a 7 inch nominal, 10,000 psi rated system that features Interventek’s Revolution safety valve. The system also includes Interventek’s PowerPlus technology, which is an arrangement of a locally integrated, gas-accumulated power source, offering valve actuation in less than a second.

The landing string also features lower and upper subsea test tree valves, a latch, a retainer valve and lubricator valve. A slick joint, shear sub and project specific adaptors enable space out in the blowout preventer (BOP) and interface with the tubing hanger running tool and landing string tubulars. The system components are integrated via pre-loaded connections that provide high operational performance and fatigue resistance.

Interventek said its new Revolution-7 landing string is market-ready and designed, engineered and fully qualified by Interventek, with testing to meet the latest API 17G 3rd edition industry specifications.

Source: Interventek

The company believes the system is a stand-out solution, offering industry qualification to the highest standard, combined with advanced shear-seal valve technology, rapid failsafe gas-accumulated actuation, plus an assortment of technical, functional and cost benefits. The valve performs both cutting and sealing functions, using separate internal components, in a single rotation, reducing the need for the usual secondary valve to provide a post-cut seal. With fewer components, the landing string system is compact and lightweight, but stronger and more fit-for-purpose. Supply lead time, redress and maintenance are faster, which in turn reduces project and lifetime costs. The system is suitable for deployment in all BOPs and its modular nature allows additional or alternative valve functions to be incorporated.

For subsea well completion, intervention, workover or decommissioning operations, a landing string is deployed from a floating vessel via a marine riser to enable safe and environmentally secure operations. The landing string system includes a subsea test tree which provides the capability to close in the well, cut any medium in the bore and disconnect in the event of an emergency.

The shear-and-seal Revolution valve technology used in the in-riser system is also compatible with open water, tree-on-tree abandonment and surface applications. Interventek is also working toward the provision of a subsea control system to complement their landing string package.